The 2018 Christmas season, which was named after the English poet Sir Arthur Conan Doyle’s 1897 novel The Sign of Four, is one of the most significant and colourful in Australian history.
With the season celebrated in the UK, Australia and New Zealand, this year marks the 50th anniversary of the novel.
Sir Arthur was born in 1883 and his family moved to London in 1892.
He became the first Australian to become a British citizen in 1910.
The year was marked by a series of big events in Australia, including the coronavirus pandemic, the first World War, the Second World War and the second Australian election.
The 2018 Christmas episode is the last of four Christmas specials to air before the start of the New Year.
The episode, which is being produced by series creator David Milne and written by Milne, is set in Victorian era England and features actors Katey Sagal and Emily Mortimer, with guest appearances from Nick Frost and Matt Bomer.
The special is written by David Milnes and stars Emily Mortimillis, Katey Saghal and Matt Berry.
Milne, who has written and produced several series including the hit BBC One show I, Claudius, will produce alongside showrunner Peter Mancuso.
The series is one that has been watched by more than 13 million people.